| 摘要 |
<p>An improved sock having a earthboard (1) consisting of plastic, preferably of wear-resistant thermoplastic material with the main advantage of reduced friction coefficient resulting in less traction force demand and low fuel consumption when in use. A process for the manufacture of said improved sock earthboard (1) of plastic material enables an efficient and economical production of earthboards in large series at low production cost level. A suitable moisturization of the soil during ploughing causing further friction reduction may also be provided for. Because of improved gliding characteristics of the soil over the earthboard surface the invented new sock earthboards may have a reduced slim shape resulting in saving of sheet material when compared with known devices made of high quality steel.</p> |
